IN GAS-ASSISTED INJECTION MOLDING

Liang Jicai

(College of Materials Science and Engineering, Jilin University, Changchun 130025)

Wu Boda

(College of Mechanical Science and Engineering, Jilin University, Changchun 130025)

Li Yi  Fu Peifu  Chen Liheng  Zhang Jingmin

(College of Materials Science and Engineering, Jilin University, Changchun 130025)

Abstract: The diffused feature of gas penetration polymer melt during gas-assisted injection molding is studied. Results show the degree that gas lashed polymer melt is severe, and there are some complex fluid patterns and diffused feature near the point of gas injection. When there is some distance between the point to which the gas bubble penetrated the polymer melt and the point of gas injection, the gas bubble is even. At the tip of the gas bubble, it becomes long and thin for the second penetration. Some useful technology of gas-assisted injection molding development and mould design guildlines are obtained by means of experiment and theoretical analysis.

Key words: Gas-assisted injection moulding  High-pressure gas  Efflux diffused feature  Analysis

CLC No: TG386

国家科技攻关项目(2004BA907A19-2)和吉林省科技厅自然科学基金(20020614)资助项目. Received 20040709, received in revised form 20041230